Method of drawing glass.



No. 890,869. PATENTED JUNE 16, 1908.

. R. S. PEASE.

METHOD OF DRAWING GLASS. urmouron FILED BEPT.8,1904. mmnwzn 00119, 1907.

I INVENI'OH 17.5.Peaoe fiA/g nvmann thisfiue 9 is en and is adapted to register 55 sage'll and the fines 9 am UNI; TED snares PATENT orrrcn ROGER s. raise, or AELEGHENY, PENNSYLVANIA, ASSIGNOR ro ALFRED M. TRUSTEE, OF rITTsBuRe PENNSYLVANIA.

IVETHOD OF DRAWING GLASS.

Specification of Letters Patent. Application filed September 8, 1904, Serial No. 223,712. Renewed October 9,

Patented June 16, 1908.

1907. Serial No.396.662.

To all whom it may concern:

Be it known that-li, ROGER S. PEAsE, a citizen of the United States, residing at Alleghen y, in the county of Allegheny and State of Pennsylvania, have invented or discovered new and useful Im rovements in Methods of Drawing Glass, 0 which the following is a specification.

My invention relates to methods of drawing glass from a molten bath, and its object is to reinforce the lass as-it is stretched from a fpreliminary'bubble or gather into the desired diameter of the cylinder or article to be drawn. I

'- .Referring to the drawings which form a part of this specification, Figure 1 is a vertical section of one form of apparatus by which my improved method may be practiced; Fig. 2, an enlarged vertical section of the bait shown in Fig. 1; and Fig. 3 is a bottom plan thereof.

Referring now to Fig. 1, 1' represents a cylindrical pot mounted axially on the car 2. 3 represents a gas burner situated at theupper part of 'the interior of the pot by which the glass is melted during the drawing 0 eration and the trough portion of the pot re eat-' ed after the drawing operation. Connected to one side of the pot is the trough 4 having thejouter lip 5 and the inner lip 6 between which lies the surface of the glass from which the drawing is made. The upper surface of these lips lies slightly above the upper wall or ii of the passage 7 which conveys the melted ass from the cylindrical portion of the pot mto the trough. The glass should be of a sufiicient dleipth in the trough to keep the drawing su ac-eat the proper temperature. 8 represents a chimney having a lateral flue 9 extending over the pot. The lower end of with the mout of the trough 4 whenthe ml; is rotated into the position shown by the riotted lines, in which position the-passage 7 and the trough furnish a path for the escape of the products. oicombustion from the burner 3, the burner serving at the same time to rci heat the trough and melt out any glass adherin thereto. The flue 9 is provided with a branch fine 10, which registers with the passage 11. in the upper side of the ot l in its normal or 'drawing position. uring the drawing 0 eration the products of combustion from t 10 burner 3 esca e through the pasi ll) into the chimhorizontal plane.

ney 8. 12 designates a stop-lug secured to the pot 1, the lug engaging with the lower side of the wall 13 when the pot has been rotated down into the position for drawing glass as shown. 1

Referring now to all the figures on the drawing. 14 designates the drawing tool or bait by which the glass is raised from the pot and made into'cylimlrical form. The bait is provided with a central vertical tube 15 which forms a port-ion thereof, and. by which the other portions are supported. To the tube 15 are secured the arms 16 PFOYHltll on their under side with flanges l7 and 1S,,e;n-

centric Withthe tube. Sleeved upon these flanges 17 and 18 are the shirts 19 and 20 which are clamped between the ilangcs and the bands 21 and 22 by means of the bolts 23.

The lower ends of the. tube 15 and the skirts 19 and 20 are in substantially the same The skirts may be provided with notched lower edges in ordcr'to present separated points for the attachment ofthe glass, or may be straight across like the lower end of tube 15, as preferred. Although I have shown the shirts notched, thev may be of any suitable construction which will present a series of separated points to the glass and I do not limit myself to the continuous band in the construction of the shirts, as they may be made Wholly of separated parts serially arranged 01' of one or more parts presenting the required attaching points of the glass. I do not limit the word skirt to any usual use or idea of the term, but desire to include any endless series of points or separated surfaces for the attachment of the glass, whether these points or surfaces are wholly distinct or separatedi'roln each other, or secured to or integral with a commonsup- 'port. The tube 15 would referably be con1- posed of a composition w lose ooeilicient of expansion is the. same as that of the glass 1n or(. or to prevent the glass cracking around it during its cooling.

Supposing the pot to be filled with glass at v the level shown in Fi l. the bait is lmvm'od into the glass and the latter allowed to bocomc attached thereto in the usual manner. The bait is then raised and air blown in through the tube 15. At the beginning of this operation the blowing will form a small bubble as indicated by the dotted line 24.

Ifit were now required to make a cylinder from this preliminary bubble, it is clear that the glass of which the bubble is composed must be stretched and therefore its wall thinned in order to obtain the required dinnameter of the cylinder. Where the cylinder 5 is of considerable diameter the shoulder where the cylinder begins is necessarily very thin and in practically all cases the cylinder will be thinner, at this point than it is desired to have it. It is an impossibility to increase the thickness of the cylinder wall after the cylinder proper has been started. My improved bait overcomes this objectionable thinning of the cylinder wall in the following manner:After.,the preliininary bubble 2d 5 has been expanded so as to become materiajliy thinned it comes in contact with the deperit ing skirt of glass 25 attached to the bait skirt 19, the original bubble wall and the skirt 25 merging into a reinforced or thickened skirt or wall 26. As the blowing is continuedthe reinforced skirt 26 becomes stretched and thinned and finally comes into contact with the skirt of glass 27 hanging to the skirt 20, the two skirts 26 and 27 forming a new reinforced skirt 28 which I have shown to be the starting place off the cylinder pro er. The tube may be regarded also as a s rirt.

I have shown the air admitted through the bait, but I do'not limit myself to this construction since it is immaterial to the broad idea of my invention whether the air is introduced through the bait or through the glass in thepot after the manner well known in the art.

' When-the drawing has been completed the cylinder is'cut off from any glass remaining in the pot and the pot rotated to the position shown. in. the dotted lines in Fig. 1. The

. burner 3 which has been keeping the glass 40 hotduring the drawing operation and sending its gases through the passage 11 and the fines 9 and 10 now finds its exit throu h the passage 7 and the trough 4 into the ue 9; whereby the glass sticking in the trough is out having the remelted and the trough reheated due to the circulation of the as through it, the pot being kept hot ready for another supply of lass. When the pot has become sufiiciently eated and pretp'ared for therece tion of an other supply 0 glass it is rotate to the position shown in full lines in Fi 1 and recharged with molten glass, anot er cylinder being drawn in the manner described.

It will be seen that my invention is not limited to the drawin of cylinders as sheets or other forms may a so be drawn from tlie ot. I do not limit In self to the precise details of construction an but desire to include within my invention all modifications which come within the scope thereof.

By the words preliminar body in the claims, I do not confine myse f to the bubble as described, but would regard my invention two skirts 26 and 27 by the air pressure withtube 15 touch the glass. In this instance the skirt 26 would be the preliminary body.

Having described my invention, I claim 1. The method of forming bodies from a molten bath, which consists in forming a preliminary body and an inclosing body from the bath, expanding the preliminary body, and merging it with the inclosing body. v 4

practice above described and claims as covering the merging of the 2. The'Ymethod of forming bodies from a molten bath, which consists in forming a preliminary bod the inclosing bodies.

Signed at Pittsburg, this sixth day of Sept,

1904.. a ROGER S'.\PEASE. Witnesses:

' "ALIOE E. DUFF,

F. N. BARBER.

and a plurality of inclosing bodies from t e bath, expanding the' reliminary "body, and merging'it successive y with 

